758. ALBERT EINSTEIN (1879-1955) American physicist whose Theory of Relativity and studies of mass and energy relationships revolutionized the field of physics. Good content T.L.S. "A. Einstein" on his blind-embossed letterhead, 1p. 4to., Princeton, Aug. 15, 1944 (at the height of the Manhattan Project), to George Perkman. Einstein, a lover of classical music and fairly accomplished violinist. He thanks the man for sending: "...the two beautiful Vivaldi Concertos. I consider Vivaldi one of the greatest musicians of all time and your edition as a real achievement of lasting value. With the expression of my heartiest thanks...". Folds, else fine condition. $1,500 - 2,000